Ah yeah, back when page load lasted 3x as long as Chrome (on a lower end device at least). I've installed the rewrite back when it was called Firefox Preview.
Long time Android Firefox user here, mainly because of Ublock. Syncing with my Mozilla account was a plus, I use Firefox on desktop because of its container tabs. Lately I switched to Brave (Android), which is noticeably faster, and supports extensions too.
How many do you enjoy?